The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Cetus is a constellation.
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.